Suppose you left your lawn mower out all winter, and it is very rusty. Of your 250,000J of work, only 100,000J go towards cuttin

Question

2 years ago

15

g the lawn. What is the efficiency of the lawn mower now?
A 40%
B 0.4%
C 0.04%
D 4%

REMINDER: PLEASE SHOW YOUR WORK!!!

1 answer:

mihalych1998 [28] · Answer 1 · 2022-07-26T14:30:39+03:00

7 0

Efficiency =

   (useful work you get out of it) / (work you put into it)

   = (100,000 J) / (250,000 J)

   =    0.4 = 40%    (choice-A)